<nav class="navbar navbar-expand-lg bg-body-tertiary">
    <div class="container-fluid">
        <a class="navbar-brand" href="./index.html">邮局订报管理系统</a>
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
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        <div class="collapse navbar-collapse" id="navbarSupportedContent">
            <ul class="navbar-nav me-auto mb-2 mb-lg-0">
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">报纸管理</a>
                    <ul class="dropdown-menu">
                        <li><a class="dropdown-item" href="./paperquery.html">报纸查询</a></li>
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                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">客户入口</a>
                    <ul class="dropdown-menu">
                        <li><a class="dropdown-item" href="./signup.html">客户注册</a></li>
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                            <hr class="dropdown-divider">
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                        <li><a class="dropdown-item" href="./subpaper.html">客户订报</a></li>
                        <li><a class="dropdown-item" href="./customerInformation.html">客户信息页面</a></li>
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            <form class="d-flex" role="search">
                <input class="form-control me-2" type="search" placeholder="没什么用的搜索框" aria-label="Search">
                <button class="btn btn-outline-success" type="submit">Search</button>
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